Shears for cutting metal.



C. WAGHTER. SHBARS T011 CUTTING METAL.

APPLICATION FILED SEPT. 23, 1908.

Patented Feb. 7, 1911.

3 SHEETS-SBEBTI.

C. WACHTER. SHBARS PoR 'CUTTING METAL. -APPLIOATIONFILED SEPT, 23, 1908.

Patented 1191121911.

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C. WACHTER. SHBARS FOB. CUTTING METAL. APPLIOATION FILED SEPT. 23, 190s.

. 'Patented Feb. 7, 1911.

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CARL WACHTER, OF WEINGABTEN, GERMANY.

SHEARS FOR CUTTING 1WETAL.

Specification of Letters Patent.

Patented Feb. '7, 1911.

Application filed September 23, 1908. Serial No. 454,316.

To all whom it may concern:

Be it known that I, CARL WAcHTER, managing director, citizen of Germany,subject of the King of Wrtemberg, residing at Weingarten, in the Kingdomof VViirtemberg and Empire of Germany, have invented certain new anduseful Improvements in Shears for Cutting Metal, of which the followingis a full, clear, and exact description.

This invention has for its object a new arrangement of the blades inshears for cutting figured iron, the essential feature of which is thatone group of blades is closed automatically at the beginning of thecutting movement, as far as the profile to be cut off requires it, andopens again at the return-movement of the blade-holder, so that theblades are automatically adjusted according to the different thicknessesof profiles to be cut. In addition to this movement of the blades one ofthe blades, arranged in the rotary blade-holder, is mounted to have anindependent pivotal movement.

A further feature of the present figured iron shears is that by thespecial arrangement of the blades it is possible to make right and leftmiter cuts on angle-irons. In consequence of the above mentionedmovement of the blades, they press closely on the prole to be cut, andthereby there is attained the cleanest and most accurate cut whencutting' figured iron of different thicknesses.

, The accompanying drawing illustrates the invention in two sample formsof construction.

Figure 1 is a front view of figured iron shears with a blade whichautomatically adjusts itself according to t-he profile to be cut. Fig. 2shows the blades in the same position as in Fig'. l, only on an enlargedscale. Fig. 3 is a section through the blades on the line A-B Fig'. 4 asection through the blades on the line C-D. Fig. 5 shows similar figurediron shears as Fig. l, in which moreover one of the blades journaled inthe rotary blade-holder is arranged in a manner that it adjusts itselfautomatically. Fig. 6 shows the arrangement of the blades according' toFig. 5, but separately. Fig. 7 is a section through Fig. G on the lineA-B. Fig. 8 shows the blades in their position ready for cutting anangle-iron. Fig. 9 shows the blades in their position ready for cuttinga strong T-iron. Fig. 10 shows the blades in their position ready forcutting a thin T- iron. Fig. 11 is a top-view of the stationaryblade-holder according to Fig. l .with the rotary blade-holder removedand a thin T-iron put in to be cut. Fig. 12 is a topview of thestationary blade-holder with the blades inserted and the rotarybladeholder removed, the blades ready for cutting angle-irons. Fig'. 13is an inside View of the rotary blade-holder with the blades insertedand the stationary blade-holder removed.

The figured iron shears consist in the form of construction shown inFigs. 1-4 and 1l of a stationary and a rotary bladeholder or carrier tand Zi. In the stationary blade-holder a are arranged the blades c andCZ, in the rotary blade-holder b the blades c and f. There is moreoverarranged in the rotary blade-holder a bolt or projection g, which setsagainst a cam t turnabl arranged in the stationary blade-holder, whenthe said cam is in the position shown in Figs. 1 and 2.

When the cutting commences, the bolt or projection g in the rotaryblade-holder moves in the cutting direction and the cam /L in thestationaryv part a, which was till now retained by the bolt, isreleased, and a spiral Spring z', likewise arranged in the stationarypart a, advances the blade Z according to the profile to be cut in amanner that the same closely sets against the profile to be cut. Whencutting angle-irons the blade CZ is on the contrary fully advanced, sothat it firmly sets against the upper blade c, and the gap c isperfectly closed.

lJVhen the cutting has taken place, the bolt or projection g presses onthe cam It, in consequence of the retrograde rotating movement impartedto it by the rotary bladeholder b, which cam, in its turn, effects thereturn of the blade Z into the open position.

In the form of construction of the shears according to Figs. 5-10 andFig. 13, the actuating, that is to say the forward and backward movementofthe blade CZ is effected, exactly as above described, by means of thecam 7i the bolt g and the spring t'. Also the blade c in the rotaryblade-holder o shows the'same arrangement as the corresponding blade cin Figs. 1 4; besides this the blade f is so arranged that it can turnin two ways. This blade f in addition to executing the general circularmovement in consequence of its beingarranged in the rotary blade-holdero, turns on its own aXis.

, blade c.

To this end the blade is fastened by means a stationary blade Carried ofa bolt fm, to the rotary blade-holder 7). It is pressed down at thebeginning of the cutt-ing by its own weight, or by other suitable means,with its point upon t-he profile to be cut in a manner that the point ofthe blade enters accurately into the angles of the figured iron, asillustrated in Figs. 9 and 10.

On the blade-holder o being turned'backward the blade y is by acheck-motion moved back into its open position, Figs, 5 andro. For thispurpose there is arranged in the stationary blade-holder a a bolt r,which, on lthe rotary blade-holder being turned, strikes apawl pprovided in the same, which has the form of' a double lever, which isthereby caused to engage with the blade f and effects thereturn-movement of the same.

Theblade can, as already mentioned, be put into a rotary movement by itsown weight, because the pivot is pressed out of' the middle. But, inorder to obtain an accurate and .reliable working of the blade, therotary movement of the same can be supported by suitable means forpressing the same* down, by draw-springs or pressure springs, buffers orthe like. In Fig. 13 this is, for instance, done by a tension spring s.

The bladesof the figured iron shears have a cutting-direction whichforms an angle of 450 with the legs or sides of the angle-iron to becut,`the blade f is slightly beveled at the edge Z. Bythe describedpeculiar movement vof lthe blades, and further owing to theirhaving acutting direction of 4:50, it is possible to cut angle irons in rightand left bevels or miters of 45, the angle-piece to be cut off being ina suitable manner introduced between the blades. In order to bevelangle-ironsthere is closed, in the first place, as already described,the gap 7c by pressing`the`blade l close against'the upper The upperblade 0, the movable blade-CZ, and the lower blade e form then an angle,between which the angle iron is introducedand cut off by the movement ofthe blades (Fig. S).

The rpawls and springs actuating the blades-may, of' course, be of adifferent construction without interfering with the essential feature ofthe invention.

Vhat I claim is:

l. An improvement in metal cutting shears comprising a stationary bladeholder, astationary blade carried thereby, a movable blade also carriedby said holder, a rotatable blade holder provided with a bladecooperating with the blades of said stationary blade holder, and a camoperated by the rotatable holder for controlling said movable blade.

2. An `improvement in metal cutting shears comprising a stationary bladeholder,

thereby, a spring pressed blade carrier mounted in said holder andprovided with a blade, a rotatable blade holder provided with a bladecooperating with the blades of the stationary blade holder, and a camoperated by said rotatable holder forholding said spring pressed bladecarrier normally retracted in opposition to the spring pressure.`

3. An improvement in `metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed bladecarrier mounted in said'holder and provided with a blade, arotatable'blade holder provided with a blade cooperating with the bladesof the stationary blade holder, a cam for retracting said spring pressedblade carrier in opposition to the spring pressure, and a projectioncarried by said rotatable holder for operating said cam.

Ll. An improvement in metal cutting shears comprising a stationaryblade=holder, a stationary blade carried thereby, a movable blade alsocarried by said stationary holder and substantially at right angles withsaid stationary blade, a rotatable blade holder provided with anapproximately AV- shaped blade cooperating with the blades of saidstationary holder, and a cam carried by the rotatable holder forcont-rolling the movable blade holder.

5. An improvement in metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed carrieralso mounted in said-holder, a blade pivotally mounted in said carrier,a rotatable blade holder provided with a blade cooperating with theblades of the stationary holder, and a cam operated by the rotatableholder for controlling said spring pressed carrier.

6. An improvement in metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed carrieralso mounted in said holder, a blade pivotally mounted in said carrier,a rotatable blade holder provided with a blade cooperating with theblades of the stationary holder, a cam operated by the rotatable holderfor controlling said spring pressed carrier, and means for positivelyswinging said pivoted blade as its carrier is withdrawn 7. Animprovement in metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed carrieralso mounted in said holder, a blade pivotally mounted in said carrier,a rotatable blade holder provided with a blade cooperating with theblades of the stationary holder, a cam operated by t-he rotatable holderfor controlling said spring pressed carrier, a pawl carried by therotatable holder for swinging said pivoted blade, and means `foroperating said pawl.

8. An improvement in metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed carrieralso mounted in said holder, a blade pivotally mounted in said Carrier,a rotatable blade holder provided with a blade eoperating with theblades of the stationary holder, a cam operated by the rotatable holderfor controlling said spring pressed carrier, a spring acting to normallydepress said ,pivoted blade, and means for positively swinging` saidpivoted blade as its carrier is withdrawn.

9. An improvement in metal eut-ting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring pressed carrieralso mounted in said holder, a bla-de pivotally mounted in said carrier,a rotatable blade holder provided with a blade coperating with theblades of the stationary holder, a cam for retraeting said springpressed blade in opposition to the spring pressure, means carried bysaid rotatable holder for operating said cam, and means for positivelyswinging said pivoted blade.

l0. An improvement in metal cutting shears comprising a stationary bladeholder, a stationary blade carried thereby, a spring' pressed carrieralso mounted in said holder, a blade pivotally mounted in said carrier,a rotatable blade holder provided with a blade eoperating with theblades of the stationary holder, a cam for retraeting said springpressed blade in opposition to the spring pressure, means carried bysaid rotatable holder for operating said Cam, a pawl earried by saidrotatable holder for swinging said pivoted blade, and means foroperating said pawl.

In witness whereof, I subscribe my signa ture, in presence of twowitnesses.

CARL WAOHTER.

lVitnesses EDUARD DIERLAMM, CARL KRBER.

